It should be 12 N. the force of the book on the table should be the same as the force of the table on the book.
Voltage is the difference in charge between two points.
Current is the rate the charge flows
Resistance is the tendency a material has to resist the flow of charge (current)
Combining voltage resistance and current Ohm developed the formula
V (Voltage)= I (Current) x R (Resistance)
pitch is the perceived frequency of a sound wave.
